Malicious PDF — malware analysis report

Static analysis result for SHA-256 54e7ebc4057dd453…

MALICIOUS

PDF

115.2 KB Created: 2021-08-07 07:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4cc9f90326965031644e549f4a8588cf SHA-1: b48f892de514eecd0db20cb22257d900c8cdc8ac SHA-256: 54e7ebc4057dd45352afe4d32aebf54f0e513670e48aea14fda26ea5151f2b99
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that exhibits characteristics of a callback phishing lure, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous embedded URLs pointing to potentially compromised WordPress sites, suggesting it's part of a larger phishing infrastructure. The ML classifier and ClamAV detection further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/fd8b0bb17b34a0b80d76bf9594ae8e77/18465319212.pdf In PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/4ed6fc647bf4d4634db6f730de1a7416/28749242353.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/xekinejipitobojib.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa672bef90---voripik.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/pawegixexabifiziturafes.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebf1bb4bed---sapategubatedawoxap.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/49o1eihc0sv85utah2kosn096d/juluwofe.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/jd7i1fkdc7ji3k7kovgol2qp90/bazanesem.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/72989784004.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/f80b0b89b92a12108dd72ab5c97314ef/jopovifimofagapi.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/1e4be234e8cf9f1fdddd9204ee3eee35/mafenojeluvisek.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/62893115544.pdfIn PDF document text
    • http://afro-safari.com/upload/files/bibugiwavame.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/rulubujuwawuloxezutoxopu.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/38c1f2e61d81119017e718c2ef213d5a/18723941625.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/38938028283.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/okam.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/4fmpemjj2j1p4s2vjchi6goohj/82675875587.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe523a023f---zaropipalakosategux.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/856d528901887a48a37189d46d75f4fa/nupineposutube.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/62705702eff4aa690d439c8a4894f618/18582675850.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc5de2f068---88597938224.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/lafivibazekemubi.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/a51567bc37666e36c69426e60fb5ce96/pomagafalikeribafidizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=noco+g7200+maintenance+modePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C5D 18948 bytes
SHA-256: 4dbdf994fe474e2a0ff4e63303eb5b484f7b5076d8a034323f54fc574da7207c
font_01_sfnt_off00018e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A667 10668 bytes
SHA-256: f7319673402b981547e9acd0dc3c5babd3e759cf33863ae0a0f788223ee944c1

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